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LLDP Configuration
When configuring LLDP, go to these sections for information you are interested in:
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Overview
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LLDP Configuration Task List
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Performing Basic LLDP Configuration
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Configuring CDP Compatibility
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Configuring LLDP Trapping
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Displaying and Maintaining LLDP
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LLDP Configuration Examples
Overview
Background
In a heterogeneous network, it is important that different types of network devices from different vendors
can discover one other and exchange configuration for interoperability and management sake. This
calls for a standard configuration exchange platform.
To address the needs, the IETF drafted the Link Layer Discovery Protocol (LLDP) in IEEE 802.1AB. The
protocol operates on the data link layer to exchange device information between directly connected
devices. With LLDP, a device sends local device information as TLV (type, length, and value) triplets in
LLDPDUs to the directly connected devices, and at the same time, stores the device information
received in LLDPDUs sent from the LLDP neighbors in a standard management information base (MIB).
It allows a network management system to fast detect Layer-2 network topology change and identify
what the change is.
For more information about MIBs, refer to
SNMP Configuration
in this manual.
Basic Concepts
LLDPDUs
LLDP sends device information in LLDP data units (LLDPDUs). LLDPDUs are encapsulated in Ethernet
II or SNAP frames.
1) LLDPDUs encapsulated in Ethernet II
